And if you want to know why it is a female noun even though it doesn't end in -e, then the answer is: just because that's how it is. No special reason.
The noun is la maison therefore une maison.
I'm sure you meant to write grammatically female noun. Maison(nf)
Sign in to submit your answer
Don't have an account yet? Join today
Test your French to the CEFR standard